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EDS spectrum of PEKK (a), PT20 (b) and PT40 (c), and EDS mapping of PEKK (d, g), PT20 (e, h) and PT40 (f, i), in which the element distribution of carbon in red (d, e, f) and Ta in green (g, h, i). (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
